Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. Min._.下(KR)
96
00:02.46
2. RelaxedCockatoo
65
00:02.90
3. CP2023
4
00:03.47
4. Jovess 00:03.79
5. jmp473
58
00:03.83
6. YouTwo#5542
111
00:03.87
7. oyatugaman
29
00:04.11
8. HackMan
104
00:04.15
9. OuO Seal
9
00:04.17
10. Solander
57
00:04.21
11. Rhododendron
129
00:04.27
12. turkhuu
7
00:04.84
13. SirFish 00:04.85
14. Pngaea
18
00:05.04
15. TrainRider17
66
00:05.16
16. arp82 00:05.22
17. xtalotov_mocktail
8
00:05.34
18. Harry_Canyon
124
00:05.36
19. jeszon
58
00:05.57
20. abcdegf
32
00:05.78
This Week
1. Min._.下(KR)
96
00:02.46
2. RelaxedCockatoo
65
00:02.90
3. YouTwo#5542
111
00:03.87
4. HackMan
104
00:04.15
5. turkhuu
7
00:04.84
6. Pngaea
18
00:05.04
7. abcdegf
32
00:05.78
8. Determined1 00:06.21
9. ScorpionMax 00:07.88
10. Harry_Canyon
124
00:07.93
11. Koakuma
47
00:11.06
12. CLAVDIVS
54
00:17.61
13. iValerie
1
00:21.61
14. romano70 00:36.65
15. chinicolas 01:41.29
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Today
1. Min._.下(KR)
96
00:02.46
2. CLAVDIVS
54
00:20.54
3.--- empty -----:--
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
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9.--- empty -----:--
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MO3
1. vowels
214
00:01.35
2. Douglas Shamlin Jr.
691
00:01.45
3. nabi
92
00:01.64
4. haramey
230
00:01.70
5. jaybrainer
233
00:01.75
6. BingBongBob
108
00:01.76
7. sfumato
166
00:01.78
8. bearn
206
00:01.91
9. numbrr
295
00:02.12
10. jai22933
23
00:02.19
AO5
1. vowels
214
00:01.43
2. Douglas Shamlin Jr.
691
00:01.47
3. nabi
92
00:01.50
4. haramey
230
00:01.78
5. jaybrainer
233
00:01.79
6. BingBongBob
108
00:01.88
7. sfumato
166
00:01.89
8. bearn
206
00:01.93
9. jai22933
23
00:02.29
10. numbrr
295
00:02.33
AO12
1. vowels
214
00:01.70
2. Douglas Shamlin Jr.
691
00:01.71
3. nabi
92
00:01.75
4. haramey
230
00:02.06
5. jaybrainer
233
00:02.14
6. bearn
206
00:02.24
7. BingBongBob
108
00:02.27
8. sfumato
166
00:02.29
9. numbrr
295
00:02.56
10. Min._.下(KR)
96
00:02.58
Robots / programmatic solversinfo  
1.cheyette00:00.119
2.Charlie Li
61
00:00.208
3.nbjohnson00:00.407

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2025-06-15 12:54:38

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